DO NOT REPLY [Bug 14310] New: - Concat throws npe if it doesn't get at least one valid file.

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=14310

Concat throws npe if it doesn't get at least one valid file.

           Summary: Concat throws npe if it doesn't get at least one valid
                    file.
           Product: Ant
           Version: 1.6Alpha (nightly)
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Major
          Priority: Other
         Component: Core tasks
        AssignedTo: ant-dev@jakarta.apache.org
        ReportedBy: gus.heck@olin.edu


Basically the code tries to create a FileInputStream from the array of strings
named input, which only contains null references. I expect that an npe might
even be thrown if only one invalid file is passed in. This probably has not been
run into before because that rarely happens with filesets. 

I guess the fact that this hasn't come up before shows how (in)frequently file
lists are used with this task :) 

Reproduction:

The following build file will create an npe

<?xml version="1.0"?>
<project name="concat-test" basedir="." default="all">

<target name="all">
   <concat destfile="TESTDEST" append="true">
      <filelist dir="." files="thisfiledoesnotexist"/>
   </concat>
</target>

</project>

This is the npe output:

[gus@draco gus]$ ~/projects/jakarta-ant/dist/bin/ant -buildfile test.xml
Buildfile: test.xml

all:
   [concat] File /home/gus/thisfiledoesnotexist does not exist.

BUILD FAILED
java.lang.NullPointerException
        at java.io.File.<init>(File.java:180)
        at java.io.FileInputStream.<init>(FileInputStream.java:66)
        at org.apache.tools.ant.taskdefs.Concat.catFiles(Concat.java:350)
        at org.apache.tools.ant.taskdefs.Concat.execute(Concat.java:268)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:309)
        at org.apache.tools.ant.Target.performTasks(Target.java:336)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1331)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1275)
        at org.apache.tools.ant.Main.runBuild(Main.java:614)
        at org.apache.tools.ant.Main.start(Main.java:197)
        at org.apache.tools.ant.Main.main(Main.java:235)

Total time: 1 second
java.lang.NullPointerException
        at java.io.File.<init>(File.java:180)
        at java.io.FileInputStream.<init>(FileInputStream.java:66)
        at org.apache.tools.ant.taskdefs.Concat.catFiles(Concat.java:350)
        at org.apache.tools.ant.taskdefs.Concat.execute(Concat.java:268)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:309)
        at org.apache.tools.ant.Target.performTasks(Target.java:336)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1331)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1275)
        at org.apache.tools.ant.Main.runBuild(Main.java:614)
        at org.apache.tools.ant.Main.start(Main.java:197)
        at org.apache.tools.ant.Main.main(Main.java:235)

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